Performance Solution Case Studies
Real performance solutions from our own files, anonymised. Each case study shows the NCC clauses involved, the problem, how we solved it and what we learned. Every report is prepared by a registered building surveyor and assessed against the relevant Performance Requirements.
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Existing stair 125 mm narrower than the accessible width
An existing stair to two new apartments measured 875 mm clear against the 1000 mm AS 1428.1 width. Targeted upgrades met D1P1 without rebuilding fire rated walls.
Restaurant cool room without floor grading or a floor drain (Tasmania)
A Tasmanian restaurant cool room was built with no floor falls and no drain, contrary to TAS I4D18. An employee management plan met TAS I4P13 instead.
First floor addition with no eaves gutters
A first floor addition was designed with no eaves gutters, shedding water onto the guttered roof below. A performance solution under H2P1 showed the roof drainage works as a system.
Below ground rumpus room: retaining wall as an external wall
An existing retaining wall became the external wall of a below ground rumpus room. Layered waterproofing and drainage met H2P1, H2P2 and H2P3 where freeboard and fall away could not.
Office spiral stair: tapered treads 5 mm short of the minimum going
An office spiral stair was installed with tapered treads about 5 mm short of the D3D14 minimum going. A performance solution under D1P2 avoided rebuilding it.
Sloping site townhouses: weepholes, ground fall and accessway gradients
A 6 metre fall across a 31 dwelling site squeezed weephole clearances, ground fall and accessway gradients. One performance solution report resolved all three under F3P1 and D1P1.